IS93C66A

The IS93C56A/66A are 2kb/4kb non-volatile, ISSI ® serial EEPROMs. They are fabricated using an enhanced CMOS design and process. The IS93C56A/66A contain power-efficient read/write memory, and organization of either 256/512 bytes of 8 bits or 128/256 words of 16 bits. When the ORG pin is connected to Vcc or left unconnected, x16 is selected; when it is connected to ground, x8 is selected. The IS93C56A/66A are fully backward compatible with IS93C56/66. An instruction set defines the operation of the devices, including read, write, and mode-enable functions. To protect against inadvertent data modification, all erase and write instructions are accepted only while the devices are write-enabled. A selected x8 byte or x16 word can be modified with a single WRITE or ERASE instruction.

Additionally, the two instructions WRITE ALL or ERASE ALL can program an entire array. Once a device begins its self-timed program procedure, the data out pin (Dout) can indicate the READY/ BUSY status by raising chip select (CS). The selftimed write cycle includes an automatic erasebefore- write capability. The devices can output any number of consecutive bytes/words using a single READ instruction.